Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco Model 41-296X with 41-285 modified chassis
#20

Hmmm...okay.

Do you have the schematic for this radio?

Locate part (58). This is the audio output transformer. See where the black wire and the white wire goes? Each of those wires go to the plate of a 41 tube. The schematic also gives the resistance measurements: 170 ohms and 190 ohms. 170 between one half of the winding and the center tap lead (black with white tracer), 190 between the other half and the center tap.

So if you measure between the two plates of the 41 tubes - in other words, between the black lead and the white lead - you should get in the neighborhood of 360 ohms.

Note there is no measurement given on the schematic of the right side of the winding - this is the secondary. You should measure only a few ohms on this winding.

Yes, those three wires do have little "bumps" or "berries" on them. All audio output transformer primary leads get that way in these 1939-42 Philcos. I don't know why.

Some time spent in learning the symbols of a schematic diagram will be a big help here. This link does not include symbols for tubes, but will get you started:
http://www.wisc-online.com/objects/index...ID=DCE1902

And here's another page, with tube symbols:
http://library.thinkquest.org/10784/circ...mbols.html
It's like learning to read a road map. A schematic diagram is sort of a road map of your radio; it shows how everything is connected.

Edit: Oh, yes, please DO replace that fried 160 volt cap with a new 450 volt cap!

--
Ron Ramirez
Ferdinand IN


Messages In This Thread
Re: Philco Model 41-296X with 41-285 modified chassis - by Ron Ramirez - 12-02-2009, 09:26 AM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
The list of my radio & TV collection!
Yes, Michael. But strangely enough, I managed to keep the original veneer. I must admit that I don't really like it, so ...RadioSvit — 02:21 PM
The list of my radio & TV collection!
Good radio. I bet there was a lot of veneer fixing.morzh — 02:16 PM
Philco 46-480 Electronic Restoration
>> it is because I am retired and a little demented. You have just the right amount of it. No perfectly sane p...morzh — 02:14 PM
The list of my radio & TV collection!
Old Zenith 5S-29 tube radio. First turn-on after repair and reception quality testing. Demonstration of the operation of...RadioSvit — 01:27 PM
Philco 42-345 Restoration/Repair
Welcome to the Phorum, osanders0311!  Regardless how far you intend to restore this set, first priority should be replac...GarySP — 11:51 AM
Philco 46-480 Electronic Restoration
Joseph, it is because I am retired and a little demented. My problem is that I wanted to own a collection that spans th...MrFixr55 — 11:29 AM
Philco 46-480 Electronic Restoration
Wow, here I am with only two restored radios. I’ve got to boost those numbers! If you can’t run with the big dogs, you m...jrblasde — 10:04 AM
Philco 46-480 Electronic Restoration
Hello MrFixr55, That will for sure keep you out of trouble! Last Sunday was spent mostly doing yard work anyway the we...radiorich — 09:50 AM
Philco 46-480 Electronic Restoration
Throw in all the Audio equipment that has to be kept in a bedroom (my office)L. 8 portable self contained PA speakers, ...MrFixr55 — 07:40 AM
Philco 42-345 Restoration/Repair
Looking at the pic supplied by Rod B, you can duplicate the missing loop antenna. 10 gauge copper wire can be used to m...MrFixr55 — 01:20 AM

[-]
Who's Online
There are currently 1251 online users. [Complete List]
» 2 Member(s) | 1249 Guest(s)
AvatarAvatar

>